Hermann maul



(NoModeL) H.1VIAUL. DOOR CHAIN AND UNGOUPLING DEVICE THEREFOR.

No. 400,930. Patented Apr. 9,1889

N. PHERS hwlo-Liuwgraphar, wmm m. n. z;

UNITED STATES PATENT OFFICE.

HERMANN MAUL, OF DRESDENfSAXONY, GERMANY, ASSIGNOR TO MAX ROST, OF SAME PLACE.

DOOR-CHAIN AND UNCOUPLING DEVICE THEREFOR.

SPECIFICATION forming part of Letters Patent No. 400,930, dated April 9, 1889.

Application filed October 8, 1888.

To all whom, it may concern:

Be it known that I, HERMANN MAUL, mechanician, of Dresden, Gerberstrasse, No. 16, a citizen of Germany, residing at Dresden, in the Kingdom of Saxony, Germany, have invented certain new and useful Improvements in Door-Chains and Uncoupling Devices Therefor; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of this invention is to provide convenient means for unfastening from a distance a door secured by a chain.

To this end the said invention consists, chiefly, in the combination of such a chain and the devices whereby one end of said chain is attached, with pneumatic mechanism arranged to release at will said attaching devices when operated from a distance.

The said invention consists, further, in the combination of a movable bracket and a plate to which it is attached with adoor-chain having its knob supported on said bracket, a fixed slotted casing, which holds said knob while the latter is on said bracket, an expansible bag or cushion for moving said plate to withdraw said bracket, and a compressible ball and tube, whereby said bag or cushion is expanded at will.

In the accompanying drawings, Figure 1 represents a vertical section'of the devices embodying my invention. Fig. 2 represents a front elevation of the same. Fig. 3 represents a rear elevation of the same. Fig. 4 represents a horizontal section taken just above the knob-supporting bracket. Fig. 5 represents a horizontal sect-ion taken through the expansible bag or cushion; and Fig. 6 represents a plan view of a door, door-j amb, fastening-chain, releasing devices, and a bed from the side of which they may be operated.

In said drawings, A designates the door, and B the door-jamb, which are connected by chain a, this chain being permanently secured at one end to said door by astaple, b, and detachablyfastened at the other end to a casing, H, fixed on saidjamb. This casing extends outward from said jamb, as shown in Fig. 5, to

leave space between them for the actuating devices hereinafter described. Said casing has on its front a supplemental casing, h, in the form of a short tube vertically arranged, and

having in its face a slot, h extending from the bottom of said casing h upward nearly to the top. The proximate end of the chain a is provided with a knob, c, which enters said casing h from below, the next link of the chain passing up at the same time in slot h. This knob is prevented from falling by a bracket or shelf, p, which enters said supplemental casing from behind through a slot, W. This shelf or bracket is attached to a plate, a, pivoted atits lower end on a transverse rod, 2',

attached to the casing H. A spring, f, bears against the rear of said plate above its pivoted line, and forces bracket or shelf 1) into casing h under knob c, as stated. In front of the upper part of plate a is an expansible bag or cushion, b, preferably of india-rubber, which is supplied with air at will through tubes 7" and 8, arranged continuously. The outer tube, 4", can be carried to the side of a bed, 0, Fig. 6, or any other convenient point,

where it terminates in an air-forcing device. This may be simply a ball of india-rubber, g, compressible by hand. The occupant of the bed grasps and squeezes this ball, causing an immediate expansion of elastic bag or cushion 19', and consequent backward motion of plate a and bracket or shelf p. The knob c then drops out of casing h, thus freeing the chain a and door A. NVhen the door is to be fastened again, the plate a and the shelf p shelf or bracket is formed with a semicircular o recess, p to facilitate the introduction of said knob and prevent the contact of the shelf with the chain. 7

Having thus described my invention, what I claim as new, and desire to secure by Letters 5 Patent, is

1. In combination with a door-chain having a knob on its detachable end, a casing slotted to receive said knob, a movable shelf or bracket for retaining said knob in said cas- 'Ioo tered from the rear by said shelf, and a doorchain provided with a knob which enters said slotted supplemental casing from below and rests therein on said shelf or bracket until 1 released, as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

I-IERMANN MAUL. \Vitnesses:

CARL FR. REICHELT, PAUL DRUcKMiiLLER. 

